Mirabelle Delafield
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| Portrayed by Emily Berrington | |
| Full Name | Mirabelle Cecilia Delafield |
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| Associated Noble House(s) | Marquessate of Hollomere, Earldom of Thernope |
| Date of Birth | 3rd January, 1790 |
| Father | John Seymour |
| Father's Rank | Earl of Thernope |
| Mother | Dorothy Seymour nee Sharpe |
| Mother's Rank | Countess of Thernope |
| Town Residence | {{{residence}}} |
| Year of Debut | 1807 |
| Dowry | |
| Year of Marriage | 1808 |
| Spouse | Charles Delafield |
| Spouse's Rank | Marquess of Hollomere |
| Issue | Christian Delafield, b. 1709 and Anne Delafield, b.1709 |
Mirabelle Delafield the Marchioness of Hollomere was born Mirabelle Seymour, the eldest daughter of John Seymour, Earl of Thernope and his wife Dorothy Seymour nee Sharpe. Her husband Charles is an invalid, and Mirabelle finds her happiness in having fun, whether that be attending parties, buying clothes or having affairs.